Bed foundation having a structural foam perimeter utilizing mechanical interlocking

ABSTRACT

A bed foundation includes, in an advantageous form, a sidewall frame, a box-spring array, at least one spring interconnect, and at least a first structural foam layer. The sidewall frame includes a plurality of interlocking frame members. The sidewall frame has a frame interior, a frame top, and a frame bottom. The box-spring array is received within the frame interior and includes a plurality of springs. The at least one spring interconnect extends from the sidewall frame and into the frame interior. At least one spring interconnect interacts with at least one spring to thereby aid in retaining that at least one spring in place relative to the sidewall frame. The first structural foam layer is attached to one of the frame top and the frame bottom and extends thereacross. Advantageously, this first structural foam layer forms a mechanical interlock with the sidewall frame at the given one of frame top and the frame bottom to which it is attached.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a bed support or foundation having aperimeter formed of structural foam, and more particularly to astructural foam perimeter which utilizes mechanical interlocking toattach the various structural foam portions to each other and/or to abox spring set carried therewithin.

2. Description of the Related Art

Most beds available today employ a form of a bed support. With the useof a standard mattress, this bed support typically comes in the form ofa set of box springs. In the case of a waterbed, this bed support isgenerally designed to enclose a waterbed bladder carried therewithin.Other bed supports may incorporate another type of interior supportmember such as an air bladder or a foam insert.

When the bed support is a standard set of box springs, there are certainassociated drawbacks therewith. Such drawbacks include, but are notlimited to, the “edge roll” that occurs as consumers sit or lay on orvery near the edge of the bed. This edge roll effect is the tendency ofthe consumer to feel as though he/she is rolling/leaning off of the edgeof the bed. This edge roll effect occurs due to springs along theperimeter of the box spring becoming loosened from the interior springswithin the box-spring array and actually leaning outward toward theedges of the box springs. While there have been some attempts in the artto correct this “edge roll” the results have been less than ideal andhave been generally labor intensive (as an example, the use of twistties to attempt to attach the perimeter springs with adjacent interiorsprings within the box-spring array).

Other shortcomings are generally associated with the standard set of boxsprings. One drawback is the spring noise which can be associatedtherewith. Additionally, the standard set of box springs generallyrequires the employment of a significant amount of wood and carpentryexpertise, thereby contributing to the expense thereof.

In an attempt to counteract some of the problems associated with bedsupports and especially box spring sets, polyurethane foam products havebeen developed as bed support perimeters. However, such polyurethaneperimeters have generally required a gluing step for their attachment toone another. There are several problems associated with such gluing.Gluing is a labor intensive process; gluing creates emissions of gasthat may potentially be noxious to those working with and around them;and such glue requires a certain period in which to set, therebynecessitating a large number of premade supports taking up a large areaof factory space and thereby decreasing the potential throughput of bedsupports created during a production cycle.

What is needed in the art is a bed support unit incorporating astructural foam perimeter which avoids the need for gluing to attach theportions thereof together and which, even more ideally, provides a meansto decrease “edge roll” associated with standard bed foundation units.

SUMMARY OF THE INVENTION

The present invention generally relates to a perimeter for a bed supportthat is made of structural foam and provides for mechanical interlockingportions as part of the sections of the perimeter. Such interlockingmembers are structured and arranged to selectively facilitate theinterconnection of the perimeter members to one another, to couple theperimeter members with the outlying perimeter springs within the arrayof box springs to reduce “edge roll”, and/or to ease the joinder betweenthe perimeter members and a top and/or bottom structural foam piece,(e.g., the topper or bottom, respectively).

The present invention, in one particular form thereof, relates to a bedfoundation including a first bed frame member and a second bed framemember. The first bed frame member is composed of a structural foam andhas a pair of first frame member ends. At least one first frame memberend has a first mechanical interconnect portion associated therewith.The second frame member is composed of a structural foam and has a pairof second frame member ends. At least one second frame member end has asecond mechanical interconnect portion associated therewith. One of thefirst mechanical interconnect portion and the second mechanicalinterconnect portion is preferably one of slidably received and snap-fitwithin the other of the first mechanical interconnect portion and thesecond mechanical interconnect portion. The first mechanicalinterconnect portion and the second mechanical interconnect portionthereby form an interlocking connection.

The present invention, in another form thereof, sets forth a bedfoundation including a sidewall frame, a box-spring array, and at leastone spring interconnect mechanism. The sidewall frame defines a frameinterior, and the box-spring array is received with such a frameinterior. The box-spring array includes a plurality of perimetersprings, each being adjacent the sidewall frame. The at least one frameinterconnect mechanism extends from the sidewall frame and into theframe interior. At least one spring interconnect mechanism interactswith at least one perimeter spring to thereby aid in retaining the atleast one perimeter spring in place relative to the sidewall frame.

The present invention, in another form thereof, sets forth a bedfoundation including a sidewall frame and a first structural foam layer.The sidewall frame has a frame top and a frame bottom. The firststructural foam layer is mechanically interlocked with the sidewallframe and extends across one of the frame top and the frame bottom.

The present invention, in still another form thereof, sets forth a bedfoundation including a sidewall frame, a box-spring array, at least onespring interconnection mechanism, and at least a first structural foamlayer. The first sidewall frame is made up of a plurality ofmechanically interlocking frame members. The sidewall frame has a frameinterior, a frame top, and a frame bottom. The box-spring array isreceived within the frame interior, and such an array includes aplurality of springs. The at least one spring interconnect mechanismextends from the sidewall frame and into the frame interior. At leastone spring interconnect mechanism interacts with at least one spring tothereby aid in retaining the at least one spring in place relative tothe sidewall frame. The at least first structural foam layer ismechanically interlocked with the sidewall frame at one of the frame topand the frame bottom and correspondingly extends thereacross.

An advantage of the present invention is that the cost of manufacturingsuch a bed foundation, utilizing the mechanically interconnectingmembers of the present invention, is reduced over the cost associatedwith supports using standard box springs and with those using structuralfoam members attached via a resin, glue, or other adhesive, due to costsavings related to both assembly and parts.

Another advantage of the present invention is that the ability of thefoam perimeter to interlock at least with a portion of the perimetersprings within the box-spring array helps to reduce the occurrence of“edge roll”.

Yet another advantage of the present invention is that it permits thecreation of a tub/box that is capable of supporting/containing any oneof a foam support insert, a box-spring array, an air bladder, a waterbed bladder, or other interior support mechanism/system.

A series of advantages are associated with the use of a foam tub/box isthat such a tub or box has an inherently cushiony feeling and isreasonably durable, sufficiently supportive, and inexpensive to produce.

An even further advantage of the present invention is that structuralfoam pieces can be cut to shape using computer controlled machinery(e.g., die cutting machines), thereby increasing the efficiency andaccuracy possible with their production.

An additional advantage of the present invention is that the foammembers will aid in dampening spring noise associated with a standardset of box springs.

BRIEF DESCRIPTION OF THE DRAWINGS

The above-mentioned and other features and advantages of this invention,and the manner of attaining them, will become more apparent and theinvention will be better understood by reference to the followingdescription of various embodiments of the invention taken in conjunctionwith the accompanying drawings, wherein:

FIGS. 1A-H are schematic, top views of sidewall frames according to thefirst aspect of the present invention, incorporating various types ofmechanical interlocks for attaching adjoining frame member ends;

FIG. 2 is a top, schematic view of a bed foundation according to asecond aspect of the present invention, providing spring interconnectmechanisms for attaching the sidewall frame to at least a portion of theperimeter springs associated with a box-spring array;

FIG. 3 is a perspective view of a frame subassembly incorporatingelements of both the first and second aspects of the present invention;

FIG. 4 is a perspective view of another embodiment of a frame memberwithin the scope of the second aspect of the present invention;

FIG. 5 is a schematic, side sectional view of a bed foundation accordingto a third aspect of the present invention, the bed foundationincorporating both a topper and a bottom along with a sidewall frame tothereby house an inner-foundation component; and

FIG. 6 is a side, perspective view of an alternative embodiment of aspring interconnect mechanism of the present invention.

Corresponding reference characters indicate corresponding partsthroughout the several views. The exemplifications set out hereinillustrate at least one preferred embodiment of the invention, in oneform, and such exemplifications are not to be construed as limiting thescope of the invention in any manner.

DETAILED DESCRIPTION OF THE INVENTION

The first aspect of the present invention is illustrated in FIGS. 1 a-1h, illustrating the concept of interlocking frame members for creating aframe/perimeter of a bed foundation according to the present invention.Frame assemblies 10 a-10 h each include, respectively, a first springmember 12 a-12 h and a second frame member 14 a-14 h. First springmember 12 a-12 h is in turn supplied with a male connecting portion 16a-16 h, respectively, while second frame member 14 a-14 h is suppliedwith a female connector portion 18 a-18 h, respectively. Such connectorportions 16 a-16 h are able to snap fit and/or slideably connect withrespective female member 18 a-18 h.

As illustrated, any of a variety of connection configurations may beemployed with respect to the interconnecting portions, so long as asufficient interlocking is achieved between the two portions. Bycreating interlocking portions, it is possible to avoid the need tofurther glue such portions together in order to maintain a connectiontherebetween. However, it is conceivable that some sort of adhesive maybe used in connection with such a mechanical interlock to achieve evenfurther stability. Frame members 12 a-12 h and 14 a-14 h areadvantageously made of a structural foam material such as polyurethane.For optimal performance the foam type should be high ILD 40-200<<units??>> and have a density in the range of 1.5 to 6.0 <<units??>>.It is further contemplated that the interconnect provided between theportions 16 a-16 h and corresponding portions 18 a-18 h will preferablyresist disconnection upon joining thereof.

Advantageously, male connection members 16 a-16 h can be integrallyformed as part of first frame members 12 a-12 h, and likewise femaleconnector portions 18 a-18 h can be integrally formed as a portion ofsecond frame members 14 a-14 h, respectively. Such formation ofstructural foam is highly suitable to die cut operations and/or computercontrol for the formation thereof. It is, however, contemplated thatmale members 16 a-16 h could be co-formed or otherwise attached torespective members 12 a-12 h. Any such co-forming or attachment stepwould ideally lend itself to an automated process which would take anamount of time similar to that offered by die cutting and which wouldcreate a similar connective strength between male members 16 a-16 h andrespective first members 12 a-12 h, as is possible when such malemembers 16 a-16 h are formed integrally therewith.

It is to be understood that third and fourth frame members (not shown inFIGS. 1A-1H) are to be able to be connected to the frame using similarmechanical interlocks as proposed to connect first frame member 12 a-12h with respective second frame member 14 a-14 h. It is also to beunderstood that it is possible for the first frame members 12 a-12 h tohave a female connecting portion and instead for the second frame member14 a-14 h to carry the male connecting portions. Any such combination offemale-to-male connection points are possible so long as the appropriatemechanical interlock can be achieved therebetween.

A second aspect of the present invention is illustrated in FIGS. 2-4.The second inventive aspect of the present invention provides a meansfor suppressing edge roll or spring roll proximate the edge of the bedor the bed foundation. Illustrated in FIG. 2 is a bed foundation 30composed of a sidewall frame 32, a box-spring array 34, and a series ofspring interconnect mechanisms 36.

Sidewall frame 32 defines a frame interior 38 for a receiving box-springarray 34. Ideally, sidewall frame 32 is divided into multiple sectionsor members to allow for frame assembly at the end of the productioncycle to minimize the storage space needed for the bed frame 32 untilthe full frame is required. Such frame members are ideally made of astructural foam such as polyurethane. Additionally, such frame membersare advantageously provided with the interlock system illustrated inFIGS. 1A-1H to allow for a mechanical interlocking of the four framemembers. Alternatively or additionally, such members can be connectedvia the use of an adhesive or a mechanical fastener.

Box-spring array 34 includes perimeter springs 42 and interior springs44. It is the perimeter springs 42 that are the primary subject of thesecond aspect of the invention, as such perimeter springs are prone torollover and/or exhibit edge roll. Interior springs 44 are not as proneto rollover problems as they have springs on each side thereof to helpsupport and maintain the positioning of these individual springs.However, perimeter springs 42 each have one side, i.e., the side theyare facing toward sidewall frame 32, thereby making them prone torollover problems.

To counteract and minimize such rollover/edge roll, spring interconnectmechanisms 36 are provided in this second aspect of the invention. Suchspring interconnect mechanisms 36 promote the positional stability ofsidewall frame 32 with respect to at least select perimeter springs 42.Spring interconnect mechanisms 36 are able to at least partiallysurround such chosen perimeter springs 42 to help maintain thepositioning thereof relative both to the other springs within thebox-spring array 34 and with respect to sidewall frame 32.

Each spring interconnect mechanism 36 extends from sidewall frame 32and, more specifically, from a given frame member 40. Such springinterconnect mechanisms 36 are preferably integrally formed as part of asidewall frame or co-formed therewith. The integral formation ofinterconnect spring mechanisms 36 can be achieved by die cutting a givenframe member so as to include one or a series of spring interconnectmechanism 36 as part of the finally formed frame member 40.

Each spring interconnect mechanism 36 includes an extension portion 46and a retainer portion 48. The extension portion 46 is connected to arespective frame member 40, while retainer portion 48 resides at adistal end of the extension portion 46, opposite the given frame member40. The length of the extension portion 46 needs to be chosen so as topermit the spring interconnect mechanism 36 to be able to extend atleast slightly beyond the first perimeter springs 42 and into theinterior of box-spring array 34 upon assembly of bed foundation 30.Meanwhile, retainer portion 48, upon assembly, must be configured tohelp maintain at least one perimeter spring 42 in position relative toextension portion 36 and a given frame member 40. In one advantageousembodiment for extension portion 46, as shown in FIG. 2, the extensionportion 46 has an arrow shape. This arrow shape allows it to be easilyinserted between a given pair of perimeter springs 42 yet inhibitretraction from therebetween, upon assembly.

It is to be understood that extension portion 36 could have a lengthwhich would allow spring interconnect mechanism 36 to extend beyond therow of perimeter springs 42 and into one or more rows of interiorsprings 44 for greater holding power and stability. The only limitationon the distance of insertion is that the spring interconnect mechanism36 must still be able to satisfy its function of reducing rollover. Assuch, the mechanism must be able to help maintain the perimeter springor springs 42 with which it is associated in place relative tobox-spring array 34 and sidewall frame 32.

When two or more such spring interconnect mechanisms 36 are positionedadjacent one another (as per FIGS. 2 and 4), they together define aspring receiving zone 50 therebetween. In such a spring receiving zone50, at least one spring may be received. Due to the nature of such aspring receiving zone 50, it is possible to even more stably retaingiven perimeter spring(s) 42.

The frame subassembly 60, as shown in FIG. 3, employs elements of boththe first and second aspect of the present invention. Frame subassembly60 includes first frame member 62 and second frame member 64. Firstframe member 62 employs male frame member interconnect 66 at opposingends thereof, while second frame member 64 employs female interconnects68 at opposite ends thereof. FIG. 3 offers an exploded or unassembledview of a set of mating interconnects 66 and 68. Additionally, Framesubassembly 60 incorporates at least one spring interconnect mechanism70, as illustrated. It is to be understood that the use of any number ofspring interconnect mechanisms 70 is expected to improve the rolloversituation with a given set of perimeter springs 42. Thus, while it isacknowledged that the use of a plurality of mechanisms 70 would likelygain further improvements in performance with respect to edge roll, itis to be understood that the present invention contemplates the scenarioin which a single interconnect mechanism 70 is employed on a given framemember 40.

Frame member 80 (FIG. 4) has a plurality of T-shaped spring interconnectmechanisms extending therefrom for the purpose of stabilizing theposition of perimeter springs 84 (schematically indicated). As shown,such spring interconnect mechanisms 82 extend the foundation height 86and are repeated along the foundation length 88 (or width asappropriate). Each pair of adjacent T-spring interconnect mechanisms 82together define a spring receiving zone 90 for a given perimeter spring84 and further define a spring insertion gap 92 through which aparticular spring 84 may be snap fit into zone 90. Like other structuralfoam members of the present invention, frame member 80 with T-shapedspring interconnect mechanisms 82 is advantageously formed of astructural foam such as polyurethane. Furthermore, it preferably has amaterial density in a range of about 1.5 to 6.0 <unit??> and anassociated ILD of 30 to 100<unit?>.

Bed foundation 100 displayed in FIG. 5 includes a sidewall frame 102, atopper 104, and a bottom 106, which together house an inner-foundationcomponent 108. Each of sidewall frame 102, topper 104, and bottom 106are advantageously made of a structural foam material. It is further tobe understood that one of topper and bottom could potentially not beprovided, thereby creating a tub formation for housing a particularinner-foundation component 108. Inner-foundation component 108 may be,for example, any one of a structural polyurethane foam insert, an airbladder, a water bed bladder, or a box-spring array. It is further to beunderstood that any foundation component which would provide the user ofthe bed an appropriate degree of support and comfort is also within thescope of the present invention.

As further indicated in FIG. 5, a mechanical interlock may be providedbetween frame top 112 and topper 104 and/or between frame bottom 114 andbottom piece 106. Mechanical interlock 110 offers similar advantages asdiscussed with respect to an mechanical interlock between adjoining foammember ends. Further, it is understood that, additionally oralternatively, another type of joining means may be employed betweenframe 102 and topper 104 and/or bottom 106. These joining means mayinclude, but are not necessarily limited to, other types of mechanicalconnectors and/or adhesives. It is to be further understood thatsidewall frame 102 can further employ the frame-member interlockconcept, as per the first aspect of the invention, and/or the springinterconnect mechanism associated with the second aspect of theinvention.

Spring interconnect mechanism 120 represents a further alternateembodiment of the present invention. This spring interconnect mechanism120 for stabilizing the position of a particular perimeter edge coil orspring 122 includes a cylinder insert 124, a hook member 172, and anextension portion 174. Cylinder insert 124 is configured for insertioninto a particular edge coil 122. This cylinder insert can be then heldin place upon the attaching of hook member 172 around a bed foundationand frame portion (not shown). While this particular spring interconnectmechanism 120 can be potentially incorporated with other embodiments ofthe present invention, a potential particular use as such a springinterconnect mechanism 120 is that it would allow for retrofitting ofcurrent box-spring bed foundations with such a mechanism 120 to therebyhelp reduce edge rollover that occurs in such foundations.

It is to be understood that any of the components of the three variousaspects described herein can be used in conjunction with one another andbe within the scope of the present invention.

While this invention has been described as having a preferred design,the present invention can be further modified within the spirit andscope of this disclosure. This application is therefore intended tocover any variations, uses, or adaptations of the invention using itsgeneral principles. Further, this application is intended to cover suchdepartures from the present disclosure as come within known or customarypractice in the art to which this invention pertains and which fallwithin the limits of the appended claims.

1. A bed foundation, comprising: a first bed frame member, said firstframe member being composed of a structural foam, said first framemember having a pair of first frame member ends, at least one said firstframe member end having a first mechanical interconnect portionassociated therewith; and a second bed frame member, said second framemember being composed of a structural foam, said second frame memberhaving a pair of second frame member ends, at least one said secondframe member end having a second mechanical interconnect portionassociated therewith, said first mechanical interconnect portion andsaid second mechanical interconnect portion forming an interlockingconnection.
 2. The bed foundation of claim 1, wherein said first bedframe member and said second bed frame member define a first side walland a second side wall, respectively, of said bed foundation.
 3. The bedfoundation of claim 1, wherein at least one of said first mechanicalinterconnect portion and said second mechanical interconnect portion isone of integral and co-formed with a respective one of said first bedframe member and said second bed frame member.
 4. The bed foundation ofclaim 1, wherein said first mechanical interconnect portion and saidsecond mechanical interconnect portion together define a male/femaleinterconnection.
 5. The bed foundation of claim 4, wherein said firstmechanical interconnect portion and said second mechanical interconnectportion together define a notched interconnection.
 6. The bed foundationof claim 1, further comprising a third bed frame member and a fourth bedframe member, said third bed frame member being mechanically connectedto said first bed frame member and said fourth bed frame member, saidfourth bed frame member being further mechanically connected to saidsecond bed frame member.
 7. The bed foundation of claim 6, wherein saidthird bed frame member is interlocked with said first bed frame memberand said fourth bed frame member, said fourth bed frame member beingfurther interlocked with said second bed frame member.
 8. The bedfoundation of claim 6, wherein said first bed frame member, said secondbed frame member, third bed frame member, and a fourth bed frame membertogether define a side wall frame of said bed foundation.
 9. The bedfoundation of claim 8, wherein said side wall frame has a frame top, aframe bottom, and a frame interior, said bed foundation furtherincluding at least one of a box-spring array received within said frameinterior; a foam topper mechanically interlocked with said frame top;and a foam bottom mechanically interlocked with said frame bottom. 10.The bed foundation of claim 8, including said box-spring array receivedwithin said frame interior, said box-spring array including a pluralityof perimeter springs, each said perimeter spring being adjacent saidside wall frame, said side wall frame having at least one springinterconnect mechanism extending therefrom into said frame interior, atleast one said spring interconnect mechanism interacting with at leastone said perimeter spring to thereby aid in retaining said at least onesaid perimeter spring in place relative to said side wall frame.
 11. Abed foundation, comprising: a side wall frame defining a frame interior;a box-spring array received within said frame interior, said box-springarray including a plurality of perimeter springs, each said perimeterspring being adjacent said side wall frame; and at least one springinterconnect extending from said side wall frame and into said frameinterior, at least one said spring interconnect interacting with atleast one said perimeter spring to thereby aid in retaining said atleast one said perimeter spring in place relative to said side wallframe.
 12. The bed foundation of claim 11, including a plurality ofspring interconnects, at least one pair of said spring interconnectsbeing positioned adjacent one another in a manner so as to therebydefine a spring receiving zone therebetween, at least one said perimeterspring being received within said spring receiving zone.
 13. The bedfoundation of claim 12, wherein said at least one pair of said springinterconnects is configured for at least one of slidably fitting aroundsaid at least one said perimeter spring and forming a snap-fittherewith.
 14. The bed foundation of claim 13, wherein each said springinterconnect is T-shaped, each said spring interconnect being separatefrom each adjacent said spring interconnect, said at least one pair ofsaid spring interconnects being configured for snap fitting around atleast one said perimeter spring.
 15. The bed foundation of claim 11,wherein each said spring interconnect is one of integral and co-formedwith at least a portion of said side wall frame.
 16. The bed foundationof claim 11, wherein at least said spring interconnect has an arrowshape configured for easy insertion between two adjacent said perimetersprings and for subsequent difficult removal from therebetween.
 17. Thebed foundation of claim 11, wherein each said spring interconnect iscomposed of a structural foam material.
 18. A bed foundation,comprising: a side wall frame having a frame top and a frame bottom; anda first structural foam layer mechanically interlocked with said sidewall frame and extending across one of said frame top and said framebottom.
 19. The bed foundation of claim 18, wherein said firststructural foam layer mechanically interlocks with said side wall frameat at least one wall location on said one of said frame top and saidframe bottom.
 20. The bed foundation of claim 18, wherein said firststructural foam layer is attached to said frame top, said firststructural foam layer thereby being a foam topper.
 21. The bedfoundation of claim 18, wherein said first structural foam layer isattached to said frame bottom, said first structural foam layer therebybeing a foam bottom.
 22. The bed foundation of claim 21, wherein saidside wall frame and said foam bottom together define a foundation tubconfigured for selectably receiving one of a structural foam supportinsert, an air bladder, a water containment unit for a waterbed, and abox-spring set.
 23. The bed foundation of claim 21, further comprising asecond structural foam layer attached to said frame top, said secondstructural layer being a foam topper, said side wall frame, said foambottom, and said foam topper together defining a foundation boxconfigured for selectably receiving one of a structural foam supportinsert, an air bladder, a water containment unit for a waterbed, and abox-spring set.
 24. A bed foundation, comprising: a side wall framecomprised of a plurality of mechanically interlocking frame members,said side wall frame having a frame interior, a frame top, and a framebottom; a box-spring array received within said frame interior, saidbox-spring array including a plurality of springs; at least one springinterconnect extending from said side wall frame and into said frameinterior, at least one said spring interconnect interacting with atleast one said spring to thereby aid in retaining said at least one saidspring in place relative to said side wall frame; and at least a firststructural foam layer mechanically interlocked with said side wall frameat one of said frame top and said frame bottom and extending across saidone thereof.
 25. A bed foundation, comprising: a side wall framecomprised of a plurality of frame members, at least two said framemembers mechanically interlocking at adjoining ends thereof.
 26. The bedfoundation of claim 25, wherein said mechanical interlocking is in theform of one of a slide connection and a snap-fit.
 27. The bed foundationof claim 25, wherein said side wall frame defines a frame interior, saidbed foundation further comprising: a box-spring array received withinsaid frame interior, said box-spring array including a plurality ofsprings; and at least one spring interconnect extending from said sidewall frame and into said frame interior, at least one said springinterconnect interacting with at least one said spring to thereby aid inretaining said at least one said spring in place relative to said sidewall frame.
 28. The bed foundation of claim 25, wherein said side wallframe defines a frame top and a frame bottom, said bed foundationfurther comprising: at least a first structural foam layer attached tosaid side wall frame at one of said frame top and said frame bottom andextending across said one thereof.
 29. The bed foundation of claim 27,wherein said first structural foam layer is mechanically interlockedwith said side wall frame.